Alagarthevankkottai is a village in Tiruvadanai tehsil in district of Ramanathapuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Alagarthevankkottai was 1,854 which includes 921 males and 933 females. Alagarthevankkottai covers 1355.05 ha area. Pincode of Alagarthevankkottai is 623525.